B3 will implement an optional field in securities lending to provide custodians with visibility of the give-up participant ID for executed trades. The information will provide greater transparency and speed up the validation of orders entered by managers. It will be available both via message and on the electronic trading platform, streamlining and improving the validation of offers. For technical details, see the catalog on the project page.

Starting in July, B3's LINE Trading will adopt a new calculation for the TMOC and TMOV metrics, which define the maximum bid and ask sizes for options orders. The change will take effect in two stages: July 21, 2025, for Equity Options, and August 25, 2025, for Derivatives Options. Details of the update can be found in the LINE 5.0 | B3 version.

The submission of orders for block trade solutions Midpoint Order Book (Midpoint) or Book of Block Trade (BBT) via the ePUMA trading station has undergone improvements. The goal is to enhance the user experience and streamline the routine. The update has brought greater ease for investors as the number of fields that need to be filled out when submitting an order will be reduced. Furthermore, the tool automatically locks fields that should not be filled out, thus minimizing the chance of errors. Here's how it works: #Automatic Filling: When the instrument symbol ending in "M" (Midpoing) is entered in the ticker field, the field "Type of market" will be automatically filled as Midpoint, thereby eliminating the need for the user to fill out two fields. # Error Prevention: When the user enters the instrument symbol ending in "M" (Midpoint) or "Q" (BBT), fields that do not need to be filled out will be locked, preventing potential input errors.

Today Custodians are unable to correctly validate the manager's orders, since they do not have sufficient information to identify the Give-up Participant in securities lending trades. An optional field will be created whereby the Custodian receives data on the Give-up Participant’s ID for trades executed in the securities lending market, thus facilitating their daily trade validation routine. Such data will be available via messaging and via electronic trading platform.